1. Frequency Tuner Basic Info & How to Get It
The Frequency Tuner is an item that changes the options of Echoes.
It can be used in the Data Reconstruction of the Data Station.
You can get it from events, Personality Radio Stations, and the Sea of Trees.
2. Efficient Tips for Using Frequency Tuners
4-cost Echoes tend to drop relatively well, so it's recommended to use them on 3-cost Echoes.
This is because it is difficult to get the desired attribute damage option for 3-cost Echoes.
It is not recommended to use it on 1-cost Echoes as you can naturally obtain them through farming.
Even if the main option is good, you have to discard it if the sub-options are not good, so it's good to use it without saving it.
It's also a good idea to stockpile them for the next character you need to set up.